[Fot] Assembling new engine with old crank pulley - timing mark 12-15 degress off - why?

[Kas Kastner]

Because of this breakage of the bond problem, in the past I have always 
drilled an 1/8" hole right through both parts in the "V" of the pulley. 
Then each time I checked the engine I would fit a 1/8" length of welding rod 
into the hole to make certain the outer part had not moved in relation to 
the inner part.  Many times caught the movement.  Sometimes a little other 
times a lot.
----- Original Message ----- 
From: "Richard Gehweiler" <mini at wi.rr.com>
To: <fot at autox.team.net>; "'Scott Janzen'" <S.Janzen at comcast.net>
Sent: Saturday, April 19, 2008 5:37 PM
Subject: Re: [Fot] Assembling new engine with old crank pulley - timing mark 
12-15 degress off - why?


> Scott,
> Sometimes the vulcanizing bonding the rubber to the inner and outer metal
> parts of the vibration damper lets loose. The two parts can then move in
> relation to each other. I was timing an old British car once and I could
> actually use the timing gun to watch the timing marks rotate around the
> crank as the engine ran. Needless to say it was not possible to time that
> car as it was, had to replace the vibration damper.
>
> Richard Gehweiler
> mini at wi.rr.com
> 1.262.894.5460
>
>
> -----Original Message-----
> From: fot-bounces+mini=wi.rr.com at autox.team.net
> [mailto:fot-bounces+mini=wi.rr.com at autox.team.net] On Behalf Of Scott 
> Janzen
> Sent: Saturday, April 19, 2008 12:14 PM
> To: fot at autox.team.net
> Subject: [Fot] Assembling new engine with old crank pulley - timing mark
> 12-15 degress off - why?
>
> I am assembling a new GT6 engine, re-using the vibration damper/crank 
> pulley
> that was fitted to the previous engine - TDC marked on my flywheel, triple
> checked with dial indicator, etc.  Fitted the old damper/pulley and the 
> TDC
> mark is off by about 12-15 degrees.  did the keyways on the cranks vary 
> that
> much in location from Triumph or am I missing something?  Since it was in
> the
> correct location on the old engine I doubt the exterior casing of the 
> damper
> has slipped
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